Solution:(a) The newly introduced car was sold to the highestbidder by the company.
(b) The company sold the newly introduced car to the highest
bidder. (Incorrect Sentence Structure)
(c) The newly introduced car has sold to the highest bidder by
the company. (Incorrect Verb)
(d) The newly introduced car sold to the highest bidder by the
company. (Verb 'was' is missing)